2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142049We characterize the affine-invariant maximal extended cyclic codes. Then by the CSS construction, we derive from these codes a family of pure quantum codes. Also for ordnq even, a new family of degenerate quantum stabilizer codes is derived from the classical duadic codes. This answer an open problem asked by Aly et al.Information Theory94B05; 94B15; 94B60text